Goodwill and intangible assets (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014 Trademarks [Member]	Mar. 31, 2014 Trademarks [Member]	Mar. 31, 2014 Intellectual Property [Member]	Mar. 31, 2014 Software And Website Development [Member]	Mar. 31, 2014 Customer Lists [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
2014	$ 489			$ 3	$ 363	$ 91	$ 32
2015	489			3	363	91	32
2016	408				363	13	32
2017	391			0	363	0	28
2018	363			0	363	0	0
Thereafter	166			0	166	0	0
Total	$ 2,306	$ 2,423		$ 6	$ 1,981	$ 195	$ 124